JP6446291B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker, and more particularly to a heating cooker that cooks an object to be cooked using steam.

  Conventionally, as a heating cooker, after inputting a cooking course and the amount of a cooked item by a user operation, there is one that performs heating cooking in a heating sequence according to the cooking course and the amount of the cooked item (for example, Japanese Patent Laid-Open No. 2007-303740 (Patent Document 1)).

JP 2007-303740 A

  By the way, in the above-mentioned cooking device, after the user selects a cooking course, a rough amount (number, etc.) of the food to be cooked is entered at the user's discretion, so the weight of the food to be cooked can be set accurately. There is no problem. In that case, there is a possibility that cooking with good finish cannot be performed with a heating sequence suitable for the weight of the object to be cooked.

  Moreover, in the said heating cooker, since the operation which inputs the quantity of to-be-cooked material by a user every time it cooks, there exists a problem that convenience is bad.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cooking device that can perform cooking with good finish based on the exact weight of an object to be cooked without input by a user and can improve convenience.

In order to solve the above problems, the heating cooker of the present invention is:
A heating chamber for heating an object to be heated;
A circulation fan for circulating the gas in the heating chamber;
A temperature sensor for detecting the temperature of the atmosphere in the heating chamber;
A steam generator for generating steam to be supplied into the heating chamber;
A control device for controlling the circulation fan and the steam generator ;
A heater for heating the inside of the heating chamber;
An infrared sensor for detecting the temperature of the object to be heated in the heating chamber ,
The control device
A steam control unit that controls the steam generator so as to supply a predetermined amount of steam per unit time from the steam generator;
During the weight estimation period in which a predetermined amount of steam per unit time is supplied from the steam generator to the heating chamber by the steam control unit while circulating the gas in the heating chamber by the circulation fan, the temperature sensor A weight estimation unit that estimates the weight of the object to be heated based on the detected temperature change of the atmosphere in the heating chamber ;
Have a <br/> a heater control unit for controlling the heater,
During the weight estimation period, the steam control unit controls the steam generation device to supply a predetermined amount of steam per unit time from the steam generation unit into the heating chamber, and the heater control unit controls the heater. To control the inside of the heating chamber and
In the weight estimation period, the steam control unit alternately repeats the ON operation and the OFF operation of the steam generator, and the heater control unit turns on the heater in the OFF operation period of the steam generator,
The heating sequence after the weight estimation period is controlled based on the temperature of the object to be heated detected by the infrared sensor during the ON operation period of the heater and the weight of the object to be heated estimated by the weight estimation unit. characterized in that it.

  As is clear from the above, according to the present invention, the weight of supplying a predetermined amount of steam per unit time from the steam generator to the heating chamber by the steam control unit while circulating the gas in the heating chamber by the circulation fan. In the estimation period, based on the change in the temperature of the atmosphere in the heating chamber detected by the temperature sensor, the weight of the object to be heated is estimated, and based on the exact weight of the object to be cooked without user input. It is possible to realize a cooking device that can perform cooking with good finish and improve convenience.

FIG. 1 is a schematic front view of the heating cooker according to the first embodiment of the present invention when the door is closed. FIG. 2 is a schematic front view of the heating cooker when the door is opened. FIG. 3 is a schematic diagram for explaining the configuration of the main part of the cooking device. FIG. 4 is a schematic diagram for explaining a configuration of a main part including an air supply unit of the heating cooker. FIG. 5A is a schematic diagram for explaining the operation of the infrared sensor of the cooking device. Drawing 5B is a mimetic diagram for explaining operation of an infrared sensor of the above-mentioned cooking-by-heating machine. FIG. 5C is a schematic diagram for explaining the operation of the infrared sensor of the cooking device. Drawing 5D is a mimetic diagram for explaining operation of an infrared sensor of the above-mentioned cooking-by-heating machine. FIG. 6 is a schematic diagram for explaining the configuration of the main part including the exhaust unit of the heating cooker. FIG. 7 is a control block diagram of the cooking device. FIG. 8 is a perspective view of a state where a part of the main casing of the heating cooker is removed. FIG. 9 is a schematic rear view of a part of the circulation duct of the heating cooker. FIG. 10 is a schematic cross-sectional view taken along line XX in FIG. FIG. 11 is a diagram showing the relationship between the weight of food and the arrival time (internal temperature 160 ° C.). FIG. 12 is a diagram showing the relationship between the potato cooking time of the heating cooker and the number of output bits of the humidity sensor according to the fourth embodiment of the present invention. FIG. 13: is a schematic diagram of the principal part of the heating cooker of 5th Embodiment of this invention.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1: shows the schematic front view at the time of door closing of the heating cooker of 1st Embodiment of this invention, FIG. 2 has shown the schematic front view at the time of the door opening of the said heating cooker.

  As shown in FIGS. 1 and 2, the heating cooker according to the first embodiment includes a rectangular parallelepiped main body casing 1, a heating chamber 2 provided in the main body casing 1, and having an opening 2a on the front side. And a door 3 that opens and closes the opening 2a of the heating chamber 2.

  An exhaust duct 5 having an outlet 5 a is provided on the upper side and the rear side of the main body casing 1. A dew receptacle 6 is detachably attached to the lower part of the front surface of the main casing 1. The dew receptacle 6 is located below the door 3 and can receive water droplets from the rear surface of the door 3 (the surface on the heating chamber 2 side) and the front plate 55 of the main casing 1. A water supply tank 26 is also detachably attached to the lower part of the front surface of the main casing 1.

  The door 3 is attached to the front side of the main casing 1 so as to be rotatable about the lower side as an axis. A transparent outer glass 7 having heat resistance is provided on the front surface of the door 3 (the surface opposite to the heating chamber 2). The door 3 has a handle 8 positioned above the outer glass 7 and an operation panel 9 provided on the right side of the outer glass 7.

  The operation panel 9 has a color liquid crystal display unit 10 and a button group 11. The button group 11 includes a cancel key 12 that is pressed when heating is stopped halfway, and a start key 13 that is pressed when heating is started. The operation panel 9 is provided with an infrared light receiving unit 14 that receives infrared rays from a smartphone or the like.

  An object to be heated 15 is accommodated in the heating chamber 2. Moreover, the metal cooking trays 91 and 92 (shown in FIG. 3) can be taken in and out of the heating chamber 2. Upper shelf receivers 16 </ b> A and 16 </ b> B that support the cooking tray 91 are provided on the inner surfaces of the left side 2 b and the right side 2 c of the heating chamber 2. Moreover, lower shelf receivers 17A and 17B that support the cooking tray 92 are provided on the inner surfaces of the right side portion 2c and the left side portion 2b of the heating chamber 2 so as to be positioned below the upper shelf receivers 16A and 16B. .

  Drawing 3 is a mimetic diagram for explaining the composition of the principal part of the above-mentioned cooking-by-heating machine. In this FIG. 3, the state which looked at the heating chamber 2 from the left side is shown. In FIG. 3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  The heating cooker includes a circulation duct 18, a circulation fan 19, an upper heater 20, an intermediate heater 21, a lower heater 22, a circulation damper 23, a tube pump 25, a water supply tank 26, and a steam generator 70. I have. Each of the upper heater 20, the middle heater 21, and the lower heater 22 is composed of, for example, a sheathed heater. The tube pump 25 is an example of a pump and may be any pump that can switch between a water supply operation and a water discharge operation depending on the driving direction.

  The upper part 2e of the heating chamber 2 is connected to the rear portion 2d of the heating chamber 2 through an inclined portion 2f that is inclined with respect to the horizontal direction. The inclined portion 2f is provided with a plurality of suction ports 27 so as to face the circulation fan 19 (see FIG. 2). A plurality of upper air outlets 28 are provided in the upper part 2 e of the heating chamber 2. A plurality of first rear outlets 29, second rear outlets 30, and third rear outlets 31 are provided in the rear part 2d of the heating chamber 2 (see FIG. 2). In FIG. 3, only one of the plurality of suction ports 27 is shown. Further, in FIG. 3, only one each of the first rear outlet 29, the second rear outlet 30, and the third rear outlet 31 is shown.

  The circulation duct 18 communicates with the inside of the heating chamber 2 through the suction port 27, the upper outlet 28, and the first to third rear outlets 29-31. The circulation duct 18 is provided from the upper side to the rear side of the heating chamber 2 and extends so as to exhibit an inverted L shape. The width in the left-right direction of the circulation duct 18 is set to be narrower than the width in the left-right direction of the heating chamber 2.

  The circulation fan 19 is a centrifugal fan and is driven by a circulation fan motor 56. When the circulation fan motor 56 drives the circulation fan 19, air or saturated steam (hereinafter referred to as “air” or the like) in the heating chamber 2 is sucked into the circulation duct 18 from the plurality of suction ports 27 and circulated. Blows out radially outward of the fan 19. More specifically, on the upper side of the circulation fan 19, air or the like flows obliquely upward from the circulation fan 19 and then flows from the rear toward the front. On the other hand, below the circulation fan 19, air or the like flows obliquely downward from the circulation fan 19 and then flows downward from above. The air is an example of a heat medium.

  An internal temperature sensor 76 (shown in FIG. 7) is disposed in the circulation duct 18 and in the vicinity of the outside of the circulation fan 19. The internal temperature sensor 76 detects the temperature of the heat medium sucked from the heating chamber 2 through the suction port 27, that is, the internal temperature.

  The upper heater 20 is disposed in the circulation duct 18 and faces the upper portion 2 e of the heating chamber 2. The upper heater 20 heats air flowing to the upper outlet 28.

  The middle heater 21 is formed in an annular shape and surrounds the circulation fan 19. The middle heater 21 heats air or the like from the circulation fan 19 toward the upper heater 20 or heats air or the like from the circulation fan 19 toward the lower heater 22.

  The lower heater 22 is disposed in the circulation duct 18 and faces the rear portion 2 d of the heating chamber 2. The lower heater 22 heats air flowing to the second and third rear outlets 30 and 31.

  The circulation damper 23 is rotatably provided in the circulation duct 18 and between the middle heater 21 and the lower heater 22. The circulation damper 23 is rotated by a circulation damper motor 59 (shown in FIG. 7).

  Further, the steam generator 70 includes a metal steam generating container 71 having an upper opening, a lid portion 72 made of a heat resistant resin (for example, PPS (polyphenylene sulfide) resin) covering the upper opening of the steam generating container 71, and And a steam generating heater 73 formed of a sheathed heater cast into the bottom 71a of the steam generating container 71. Water from the water supply tank 26 accumulates on the bottom 71a of the steam generation container 71, and a steam generation heater 73 as an example of a heat source heats the water through the steam generation container 71. The saturated steam generated by heating by the steam generating heater 73 flows through the resin steam tube 35 and the metal steam pipe 36 and is supplied into the heating chamber 2 through the plurality of steam supply ports 37. (See FIG. 2). In FIG. 3, only one of the plurality of steam supply ports 37 is shown.

  The saturated steam in the heating chamber 2 is sent to the upper heater 20, the middle heater 21 and the lower heater 22 by the circulation fan 19, and heated by the upper heater 20, the middle heater 21 and the lower heater 22, thereby being 100 ° C. It becomes the above superheated steam.

  A water level sensor 75 comprising a pair of electrode rods 75a and 75b is attached to the lid portion 72. Based on whether or not the electrode rods 75a and 75b are in a conductive state, it is determined whether or not the water level on the bottom 71a of the steam generating container 71 has reached a predetermined water level.

  The tube pump 25 squeezes the elastically deformable water supply / drainage tube 40 made of silicon rubber or the like with a roller (not shown), and causes the water in the water supply tank 26 to flow to the steam generator 70 depending on the driving direction of the roller. Or the water in the steam generator 70 is caused to flow into the water supply tank 26. The water supply / drainage tube 40 is an example of a water supply path.

  The water supply tank 26 has a water supply tank main body 41 and a communication pipe 42. One end of the communication pipe 42 is located in the water supply tank body 41, while the other end of the communication pipe 42 is located outside the water supply tank 26. When the water supply tank 26 is accommodated in the tank cover 43, the other end of the communication pipe 42 is connected to the water supply / drainage tube 40 via the tank joint 44. That is, the inside of the water supply tank main body 41 communicates with the inside of the steam generator 70 via the communication pipe 42 and the like.

  The tube pump 25, the water supply tank 26, the water supply / drainage tube 40, the tank cover 43, and the tank joint portion 44 constitute a water supply device.

  FIG. 4 is a schematic diagram for explaining a configuration including the air supply unit 100 of the heating cooker. Also in FIG. 4, the state which looked at the heating chamber 2 from the right side is shown similarly to FIG. In FIG. 4, the same components as those in FIG. 3 are denoted by the same reference numerals.

  Further, a plurality of air supply openings 50 that are opened and closed by an air supply damper 51 are provided in the inclined portion 2f of the heating chamber 2 (see FIG. 2). The plurality of air supply ports 50 and the air supply fan 54 are connected via the air supply passage 101. A cooling damper 52 is provided in the first cooling passage 102 that branches from the vicinity of the air inlet 50 of the air supply passage 101. For example, the air supply fan 54 is a sirocco fan.

  Further, the infrared sensor unit 300 is disposed in the recess 310 provided in the upper part 2e of the heating chamber 2.

  The air supply fan 54 serves as a cooling fan for cooling the circulation fan motor 56 (shown in FIG. 3) and the infrared sensor unit 300. The air supply damper 51 is an example of an air supply opening / closing part. The cooling damper 52 is an example of a cooling passage opening / closing part. The air supply damper 51 (air supply opening / closing portion) and the cooling damper 52 (cooling passage opening / closing portion) constitute a switching mechanism.

  A schematic diagram showing the configuration of the infrared sensor unit 300 is shown in the lower circle of FIG. As shown in FIG. 4, the infrared sensor unit 300 includes a cylindrical housing 301 in which the axial direction is attached to a recess 310 provided in the upper part 2 e of the heating chamber 2 in the front-rear direction and the horizontal direction, and the cylindrical housing 301. A cylindrical sensor holding portion 302 rotatably supported inside, an infrared sensor 303 held by the sensor holding portion 302, and a front end of the cylindrical housing 301 are attached to the sensor holding portion 302. And an infrared sensor motor 304 to be driven. In this embodiment, the infrared sensor 303 is an area sensor that detects the temperature of 64 regions of 8 × 8, but the infrared sensor is not limited to this and may be a line sensor in which sensor portions are arranged in a straight line. .

  A heat insulating material may be provided below the infrared sensor unit 300. In this case, the temperature of 10 ° C. to 15 ° C. can be lowered than when there is no heat insulating material.

  This infrared sensor unit 300 turns the detection surface of the infrared sensor 303 toward the inside of the heating chamber 2 by rotating the cylindrical sensor holding portion 302 by the infrared sensor motor 304, and also detects the detection surface of the infrared sensor 303. Is rotated within a predetermined angle range (for example, 20 degrees) along the horizontal direction and the vertical plane of the main casing 1 (see FIGS. 5A to 5D).

  In FIG. 4, the air from the air supply fan 54 is supplied into the heating chamber 2 through the plurality of air supply ports 50 with the air supply damper 51 open. At this time, the first cooling passage 102 is closed by the cooling damper 52. Further, excess air in the heating chamber 2 naturally flows out from the natural exhaust port 45 to the fourth air passage 204.

  Next, when the air supply damper 51 is closed and the plurality of air supply ports 50 are closed and the first cooling passage 102 is opened by the cooling damper 52, a part of the air from the air supply fan 54 is exchanged with the air supply passage 101. It is supplied to the circulation fan motor 56 (shown in FIG. 3) via the first cooling passage 102.

  Further, by closing the air supply damper 51, the second cooling passage 103 provided in the vicinity of the air supply damper 51 opens, and the infrared sensor unit 300 in which the remaining air from the air supply fan 54 is disposed on the top surface side. To be supplied. The supply air passage 101, the first cooling passage 102, and the second cooling passage 103 constitute a cooling passage for cooling the circulation fan motor 56 (shown in FIG. 3) and the infrared sensor 303.

  Moreover, FIG. 5A-FIG. 5D has shown the schematic diagram for demonstrating operation | movement of the infrared sensor 303 of the said heating cooker.

  5A and 5B show a temperature detection range by the infrared sensor 303 (shown in FIG. 4) of the infrared sensor unit 300 when detecting the temperature of the object to be heated on the cooking tray 91 placed on the upper stage. The temperature detection range shown in FIG. 5A is the left region on the cooking tray 91 in front view, and the temperature detection range shown in FIG. 5B is the right region on the cooking tray 91 in front view. The cylindrical sensor holding portion 302 having the infrared sensor 303 is rotated by the infrared sensor motor 304 to swing the detection surface of the infrared sensor 303 in the left-right direction. In this embodiment, the temperature detection range of the infrared sensor 303 is divided into three regions: a left region shown in FIG. 5A, a right region shown in FIG. 5B, and a central region between the left region and the right region. However, it may be divided into four or more regions.

  5C and 5D show the temperature detection range by the infrared sensor 303 (shown in FIG. 4) of the infrared sensor unit 300 when detecting the temperature of the object to be heated on the bottom surface of the heating chamber 2. The temperature detection range shown in FIG. 5C is the left region on the bottom surface of the heating chamber 2 in front view, and the temperature detection range shown in FIG. 5D is the right region on the bottom surface of the heating chamber 2 in front view. In this embodiment, as in FIGS. 5A and 5B, the temperature detection range of the infrared sensor 303 is between the left region shown in FIG. 5C, the right region shown in FIG. 5D, and the left region and the right region. Although it is divided into three areas of the central area, it may be divided into a plurality of areas of 4 or more.

  Moreover, FIG. 6 has shown the schematic diagram for demonstrating the structure containing the exhaust unit 200 of the said heating cooker. Also in FIG. 6, the state which looked at the heating chamber 2 from the right side is shown similarly to FIG. In FIG. 6, 201 is a first air passage, 202 is a second air passage, 203 is a third air passage, and 207 is a dilution area section.

  A natural exhaust port 45 is provided at the lower end of the rear portion 2d of the heating chamber 2 (see FIG. 2). The natural exhaust port 45 communicates with the exhaust duct 5 through the fourth air passage 204 of the exhaust unit 200 (shown in FIG. 8) and the like. When the air in the heating chamber 2 becomes excessive, the excess air naturally flows out from the natural exhaust port 45 to the fourth air passage 204. A part of the air blown from the exhaust fan 47 is supplied to the front side in the main body casing 1 (shown in FIG. 1) via the third air passage 203.

  A plurality of forced exhaust ports 48 that are opened and closed by an exhaust damper 49 are provided in the inclined portion 2f of the heating chamber 2 (see FIG. 2). The forced exhaust port 48 communicates with the exhaust duct 5 via an exhaust unit 200 (shown in FIG. 8).

  A humidity sensor 53 is attached to the exhaust unit 200. The humidity sensor 53 sends a signal indicating the amount of steam contained in the exhaust gas flowing through the second wind passage 202 to the control device 90 (shown in FIG. 7).

  FIG. 7 shows a control block diagram of the cooking device.

  The cooking device includes a control device 90 including a microcomputer and an input / output circuit. The control device 90 includes an upper heater 20, an intermediate heater 21, a lower heater 22, a steam generation heater 73, a circulation fan motor 56, an exhaust fan motor 57, an air supply fan motor 58, a circulation damper motor 59, Exhaust damper motor 60, supply damper motor 61, cooling damper motor 62, operation panel 9, humidity sensor 53, internal temperature sensor 76, water level sensor 75, tube pump 25, magnetron 4, infrared sensor 303, infrared sensor A motor 304 or the like is connected.

  The internal temperature sensor 76 is disposed in the vicinity of the circulation fan 19 and detects the temperature in the circulation duct 18. The temperature in the circulation duct 18 detected by the internal temperature sensor 76 is substantially the same as the temperature of the atmosphere in the heating chamber 2 sucked through the suction port 27 by the driving of the circulation fan 19, that is, the internal temperature. .

  The control device 90 includes a steam control unit 90a that controls the steam generation device 70, a weight estimation unit 90b that estimates the weight of an object to be heated, and a heater that controls the upper heater 20, the middle heater 21, and the lower heater 22. And a control unit 90c.

  The weight estimation unit 90b estimates the weight of supplying a predetermined amount of steam per unit time from the steam generator 70 to the heating chamber 2 by the steam control unit 90a while circulating the gas in the heating chamber 2 by the circulation fan 19. During the period, the weight of the object to be heated is estimated based on the change in the temperature of the atmosphere in the heating chamber 2 detected by the internal temperature sensor 76.

  Here, in order to supply a predetermined amount of steam per unit time from the steam generator 70 into the heating chamber 2, the duty ratio of the on / off operation of the steam generating heater 73 of the steam generator 70 is made constant.

  The control device 90 is based on signals from the operation panel 9, humidity sensor 53, internal temperature sensor 76, water level sensor 75, infrared sensor 303, etc., for the upper heater 20, middle heater 21, lower heater 22, steam generation. Heater 73, circulation fan motor 56, exhaust fan motor 57, supply fan motor 58, circulation damper motor 59, exhaust damper motor 60, supply damper motor 61, cooling damper motor 62, tube pump 25 , Magnetron 4, infrared sensor motor 304 and the like are controlled.

  FIG. 8 shows a perspective view of the heating cooker from which the upper surface plate 1a and the rear surface plate (not shown) covering the upper surface and both side surfaces of the main casing 1 (shown in FIG. 1) are removed as viewed from the rear and obliquely upward. . In FIG. 8, the same components as those in FIGS. 1 to 7 are denoted by the same reference numerals.

  As shown in FIG. 8, an air supply unit 100 is provided on the rear side and the left side (right side in FIG. 8) of the heating chamber 2. The air supply unit 100 includes an air supply fan 54 arranged on the lower side, an air supply passage 101 extending upward from the air supply fan 54, and a branch from the upper side of the air supply passage 101, It has the 1st cooling channel | path 102 extended toward the motor 56 for circulation fans located in the center of the rear upper part of the store | warehouse | chamber 2. As shown in FIG. Specifically, the air supply unit 100 extends upward from the air supply fan 54 so as to exhibit an inverted L shape.

  Further, an exhaust unit 200 is provided on the rear side and the right side (left side in FIG. 8) of the heating chamber 2. The exhaust unit 200 includes a housing 210 including an exhaust unit cover 220 and an exhaust fan 47 disposed below the housing 210.

  An exhaust damper motor 60 is disposed on the right side of the upper portion of the exhaust unit 200 (left side in FIG. 8). The exhaust damper motor 60 (shown in FIG. 6) is opened and closed by the exhaust damper motor 60.

  A partition plate 312 is erected in the front-rear direction on the upper portion 2 e of the heating chamber 2. By this partition plate 312, the cooling air flowing from the second cooling passage 103 (shown in FIG. 4) provided in the vicinity of the air supply damper 51 (shown in FIG. 4) to the region of the infrared sensor unit 300 is left in the main casing 1. It is blocked so that it does not flow to the surface.

  FIG. 9 is a schematic view of the connection portion 18b and the rear portion 18c of the circulation duct 18 as seen from the rear. In FIG. 9, 18b-2 is a mounting portion, 36 is a steam pipe, and 36A is a first steam pipe.

  As shown in FIG. 9, the circulation fan unit 80 (shown in FIG. 10) is attached to the connection portion 18 b of the circulation duct 18 via a metal attachment member 82. More specifically, the connection 18b of the circulation duct 18 is provided with an opening 18b-1 through which the circulation fan 19 (shown in FIG. 10) can pass. Moreover, the attachment member 82 has the opening part 82a which overlaps with the opening part 18b-1. Further, the attachment member 82 is fixed to the connection portion 18b of the circulation duct 18 by caulking the inner peripheral edge portion of the opening portion 18b-1. The circulation fan unit 80 is fixed to the mounting member 82 with screws 96 (shown in FIG. 10).

  FIG. 10 is a schematic cross-sectional view taken along line XX in FIG. In addition, in FIG. 10, the schematic cross section of the circulation fan unit 80 is also shown. The circulation fan unit 80 has a base member 81 on which the circulation fan motor 56 is mounted. The circulation fan motor 56 includes a motor body 83 and a rotating shaft (not shown) protruding from the end surface of the motor body 83 on the base member 81 side.

  An attachment portion 18b-2 to which the internal temperature sensor 76 is attached is provided at the connection portion 18b of the circulation duct 18. The space between the connecting portion 18b and the internal temperature sensor 76 is sealed with a resin seal member 86. At this time, the seal member 86 contacts the attachment portion 18b-2. Further, a metal heat shield plate 97 is welded to the inner surface of the connecting portion 18b. The heat shield plate 97 has a facing portion 97a facing the mounting portion 18b-2.

  Thus, the internal temperature sensor 76 is disposed in the vicinity of the circulation fan 19, particularly in the vicinity of the terminal of the middle heater 21.

  Further, the mounting portion 18b-2 and the facing portion 97a are formed so that a space is formed between the mounting portion 18b-2 of the connecting portion 18b and the facing portion 97a of the heat shield plate 97. More specifically, the attachment portion 18b-2 is formed so as to protrude on the opposite side to the heating chamber 2. Thereby, a space is generated between the mounting portion 18b-2 and the facing portion 97a.

  The steam pipe 36 includes a metal first steam pipe 36A disposed outside the circulation duct 18, and a metal second steam pipe 36B disposed in the circulation duct 18 and communicating with the first steam pipe 36A. Have. The first steam pipe 36 </ b> A is attached to an attachment portion 18 b-3 provided in the connection portion 18 b of the circulation duct 18. Here, the attachment of the first steam pipe 36A is performed, for example, by caulking the end of the first steam pipe 36A on the second steam pipe 36B side. On the other hand, the second steam pipe 36 </ b> B is attached to an attachment portion 97 b provided on the heat shield plate 97. Here, the attachment of the second steam pipe 36B is performed, for example, by caulking the end of the second steam pipe 36B on the first steam pipe 36A side. Further, a gap is provided between the end of the second steam pipe 36B on the heating chamber 2 side and the inclined portion 2f.

  Next, a method for estimating the weight of food in the cooking device of the first embodiment will be described.

  FIG. 11 shows the relationship between the weight of the food and the arrival time (internal temperature 160 ° C.) when a predetermined amount of superheated steam per unit time is supplied into the heating chamber 2. In FIG. 11, the horizontal axis represents the weight [g] of the food, and the vertical axis represents the 160 ° C. arrival time [sec].

  Here, while circulating the gas in the heating chamber 2 by the circulation fan 19, a predetermined amount of steam per unit time is supplied into the heating chamber 2 from the steam generator 70a by the steam control unit 90a, and the heater control unit 90c The inside of the heating chamber 2 is heated by controlling the upper heater 20, the middle heater 21, and the lower heater 22. At this time, superheated steam circulates in the heating chamber 2 through the circulation duct 18.

In this heating cooker, the present inventor measured the time required to reach the internal temperature of 160 ° C. for the following plurality of ingredients.
□: Salted rice ◇: Chicken shine △: Pork loin ○: Unglazed chicken ■: Chicken thigh (1 bite size)
◆: No ingredients

As is apparent from the measurement results in FIG. 11, the weight of the food and the arrival time (internal temperature 160 ° C.) have a correlation. This correlation is shown in FIG. 11 where the weight is x and the arrival time is y.
y = 0.0.6041x + 286.05
It is expressed by the approximate expression of

  According to the heating cooker having the above configuration, the control device 90 heats a predetermined amount of steam per unit time from the steam generator 70 by the steam control unit 90a while circulating the gas in the heating chamber 2 by the circulation fan 19. During the weight estimation period supplied into the chamber 2, the heater controller 90c controls the upper heater 20, the middle heater 21, and the lower heater 22 to heat the inside of the heating chamber 2 so that superheated steam circulates in the heating chamber 2. To do.

  At this time, based on the change in the temperature of the atmosphere in the heating chamber 2 detected by the internal temperature sensor 76, the weight of the object to be heated is estimated by the weight estimation unit 90b. Specifically, the temperature of the atmosphere in the heating chamber 2 is predetermined during a weight estimation period in which a predetermined amount of steam per unit time is supplied into the heating chamber 2 from the steam generator 70 into the heating chamber 2 containing the object to be heated. The time to reach the temperature is measured, and the weight of the object to be heated having a correlation with the measurement time is estimated by the weight estimation unit 90b. In this way, cooking can be performed based on the exact weight of the object to be cooked without input by the user, and convenience can be improved.

  Note that the method of estimating the weight of the object to be heated by the weight estimation unit 90b is not limited to this, and the weight of the object to be heated may be estimated based on the inclination of the temperature change of the atmosphere in the heating chamber 2 during the weight estimation period. .

  In the first embodiment, the internal temperature sensor 76 is disposed in the vicinity of the circulation fan 19 to detect the temperature in the circulation duct 18. The temperature in the circulation duct 18 detected by the internal temperature sensor 76 is the temperature of the atmosphere in the heating chamber 2 sucked through the suction port 27 by driving of the circulation fan 19, that is, heat exchange with the object to be heated. Since it becomes possible to measure the temperature of the heating medium after cooking, the temperature of the atmosphere in the heating chamber 2 can be measured during cooking, and the weight estimation accuracy by the weight estimation unit 90b can be improved.

  In addition, as shown in FIG. 10, the internal temperature sensor 76 is disposed in the vicinity of the circulation fan 19, particularly in the vicinity of the terminal of the middle heater 21, so that the inside of the heating chamber 2 sucked in through the suction port 27 is arranged. In the path through which the heating medium circulates between the circulation duct 18 and the heating chamber 2, it is possible to measure the temperature while suppressing the influence of heating by the middle heater 21 after exchanging heat with the object to be heated, and the weight by the weight estimation unit 90b. The estimation accuracy of can be improved.

  Further, by controlling the heating sequence after the weight estimation period by the control device 90 based on the weight of the object to be heated estimated by the weight estimation unit 90b, for example, appropriate heating according to the weight of the object to be heated. Output and heating time can be set, and cooking with good finish becomes possible.

  In the first embodiment, the arrival time from the start of the supply of superheated steam to the heating chamber 2 until the chamber temperature reaches 160 ° C. is measured, and the weight of the object to be heated is calculated using the characteristics. Although estimated by 90b, the internal temperature which determines arrival time is not restricted to 160 degreeC, You may set suitably according to the structure of a heating cooker.

  For example, during the weight estimation period, the heater controller 90c controls the upper heater 20, the middle heater 21, and the lower heater 22 to heat the inside of the heating chamber 2 without a predetermined amount of steam per unit time from the steam generator 70. Alternatively, the weight of the object to be heated may be estimated by the weight estimation unit 90b. In this case, the internal temperature for determining the arrival time is set to less than 100 ° C.

[Second Embodiment]
Moreover, the heating cooker of 2nd Embodiment of this invention has the structure same as the heating cooker of 1st Embodiment except the operation | movement of the control apparatus 90, and uses FIGS. 1-8.

  In the heating cooker of the second embodiment, the heating sequence after the weight estimation period is performed based on the temperature of the object to be heated detected by the infrared sensor 303 and the weight of the object to be heated estimated by the weight estimation unit 90b. Control is performed by the control device 90. Thereby, an appropriate heating output and heating time can be set according to the state of the object to be heated, and cooking with good finish is possible.

  The heating cooker of the second embodiment has the same effect as the heating cooker of the first embodiment.

[Third Embodiment]
Moreover, the heating cooker of 3rd Embodiment of this invention has the structure same as the heating cooker of 1st Embodiment except the operation | movement of the control apparatus 90, and uses FIGS. 1-8.

  In the heating cooker according to the third embodiment, during the weight estimation period, the steam control unit 90a of the control device 90 alternately repeats the ON operation and the OFF operation of the steam generation device 70, and during the OFF operation period of the steam generation device 70. The upper heater 20, the middle heater 21, and the lower heater 22 are turned on by the heater controller 90c.

  Based on the temperature of the heated object detected by the infrared sensor 303 during the ON operation period of the upper heater 20, the middle heater 21, and the lower heater 22, and the weight of the heated object estimated by the weight estimating unit 90b, the weight is estimated. Control the heating sequence after the period.

  In the heating cooker, the ON operation of the steam generator 70 and the ON operation of the upper heater 20, the middle heater 21, and the lower heater 22 are repeated at a predetermined duty ratio at intervals of 60 seconds.

  Then, based on the temperature of the heated object detected by the infrared sensor 303 during the weight estimation period, it is determined whether the heated object is frozen or refrigerated. When the heated object is frozen, steam is generated. The apparatus 70 is operated at a duty ratio of 20 seconds, and the upper heater 20, the middle heater 21, and the lower heater 22 are 40 seconds.

  On the other hand, when it is determined that the object to be heated is refrigerated, the steam generator 70 is operated at a duty ratio of 9 seconds, and the upper heater 20, the middle heater 21, and the lower heater 22 are 51 seconds.

  As described above, when the object to be heated is frozen, cooking by considering thawing can be performed by increasing the amount of steam from the steam generator 70 than when the object to be heated is refrigerated.

  According to the heating cooker, by detecting the temperature of the object to be heated by the infrared sensor 303 during the ON operation period of the upper heater 20, the middle heater 21, and the lower heater 22, it is possible to prevent erroneous detection due to steam. It becomes possible to accurately determine the state of the heated object.

  The heating cooker of the said 3rd Embodiment has an effect similar to the heating cooker of 1st Embodiment.

[Fourth Embodiment]
Next, a cooking device according to a fourth embodiment of the present invention will be described.

  The cooking device of the fourth embodiment of the present invention has the same configuration as the cooking device of the first embodiment except for the operation of the control device 90.

  In the heating cooker according to the fourth embodiment, at the start of cooking, the controller 90 first circulates the gas in the heating chamber 2 by the circulation fan 19 while circulating the gas in the heating chamber 2. A predetermined amount of steam is supplied from 70 to the heating chamber 2 per unit time. In this weight estimation period, the weight estimation unit 90 b estimates the weight of the object to be heated based on the change in the humidity of the atmosphere in the heating chamber 2 detected by the humidity sensor 53.

  FIG. 12 shows the relationship between potato cooking time and the number of output bits of the humidity sensor 53 in steam cooking. In FIG. 12, the horizontal axis represents cooking time [sec], and the vertical axis represents humidity sensor output [number of bits].

The weight and state of the potato at this time are the following three.
Thin solid line: Potato 300g (Upper four cuts)
Dotted line: 300g potato (cutting 5mm upper)
Thick solid line: 1000g potato (upper 4 cuts)

  As is apparent from the measurement results of FIG. 12, the weight of the food and the humidity have a correlation.

  As described above, the humidity of the exhaust gas discharged from the heating chamber 2 through the forced exhaust port 48 is detected by the humidity sensor 53 without using the internal temperature sensor 76 or the heater heating, and based on the change in the humidity. Thus, the weight of the object to be heated can be estimated by the weight estimation unit 90b.

  Based on the weight of the object to be heated estimated by the weight estimation unit 90b, by controlling the heating sequence after the weight estimation period by the control device 90, for example, an appropriate heating output according to the weight of the object to be heated, The heating time can be set, and cooking with good finish becomes possible.

[Fifth Embodiment]
FIG. 13: has shown the schematic diagram of the principal part of the heating cooker of 5th Embodiment of this invention.

  In the heating cooker according to the fifth embodiment, in the cooking using the upper heater 20, the middle heater 21, and the lower heater 22, the outside air from the supply air fan 54 is supplied into the heating chamber 2 through the plurality of supply ports 50. To supply.

  At this time, the opening degree of each of the exhaust damper 49 and the air supply damper 51 is controlled, and the air supply port 50 and the forced exhaust port 48 are opened, so that the upper stage in the heating chamber 2 (upper shelf receivers 16A and 16B side). Regarding the temperature distribution in the upper space of the attached cooking tray 91, the temperature is high on the suction port 27 side, that is, the center side, and the temperature is low on the air supply port 50 side and the forced exhaust port 48 side, that is, both the left and right sides.

  At this time, at least one of the supply fan 54 or the exhaust fan 47 is driven by the control device 90. For example, when only the air supply fan 54 is driven, the air supply damper 51 is open, so that air from the air supply fan 54 is supplied into the heating chamber 2 through the air supply port 50 and the exhaust damper 49 is open. Therefore, the heat medium in the heating chamber 2 is pushed out through the forced exhaust port 48.

  Alternatively, when only the exhaust fan 47 is driven, since the exhaust damper 49 is open, the heat medium in the heating chamber 2 is discharged through the forced exhaust port 48, and the supply damper 51 is opened accordingly. Air flows into the heating chamber 2 through the air port 50.

  In this manner, the opening degree of the exhaust damper 49 and the supply damper 51 is controlled by the control device 90, and the temperature distribution in the heating chamber 2 is controlled, so that the heated object on the cooking tray 91 is finished. Can be partially controlled.

  In a conventional cooking device, during cooking with a heater or steam, the number of revolutions of the circulation fan (convection fan) is controlled, or the cooking finish of the food to be cooked is controlled by controlling the heater output and the amount of steam. ing.

  In such a conventional heating cooker, it is difficult to adjust the cooking finish of each food to be cooked on the same cooking tray, and there is a problem that any food can be heated only in the same way.

  On the other hand, according to the heating cooker of the said 5th Embodiment, the heating cooking from which a finish differs with respect to a several to-be-cooked object is attained.

  In the fifth embodiment, the cooking using the upper heater 20, the middle heater 21, and the lower heater 22 has been described. However, the cooking device of the present invention is not limited to this, and the steam supplied from the steam generator is used. You may apply to the heat cooking which uses.

  In the cooking device of the present invention, healthy cooking can be performed by using superheated steam or saturated steam in a microwave oven or the like. For example, in the cooking device of the present invention, superheated steam or saturated steam having a temperature of 100 ° C. or higher is supplied to the food surface, and the superheated steam or saturated steam attached to the food surface is condensed to give a large amount of latent heat of condensation to the food. So it can efficiently transfer heat to food. Moreover, when condensed water adheres to the food surface and salt and oil are dropped together with condensed water, salt and oil in the food can be reduced. Further, the inside of the heating chamber is filled with superheated steam or saturated steam and becomes in a low oxygen state, thereby enabling cooking while suppressing oxidation of food. Here, the low oxygen state refers to a state where the volume% of oxygen is 10% or less (for example, 0.5 to 3%) in the heating chamber.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to fifth embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content described in the said 1st-5th embodiment is good also as one Embodiment of this invention.

  The present invention and the embodiment are summarized as follows.

The cooking device of this invention is
A heating chamber 2 for heating an object to be heated;
A circulation fan 19 for circulating the gas in the heating chamber 2;
A temperature sensor 76 for detecting the temperature of the atmosphere in the heating chamber 2;
A steam generator 70 for generating steam to be supplied into the heating chamber 2;
A control device 90 for controlling the circulation fan 19 and the steam generator 70;
The control device 90 includes:
A steam control unit 90a for controlling the steam generator 70 so as to supply a predetermined amount of steam per unit time from the steam generator 70;
During the weight estimation period in which a predetermined amount of steam is supplied from the steam generator 70 to the heating chamber 2 by the steam control unit 90a while circulating the gas in the heating chamber 2 by the circulation fan 19. And a weight estimating unit 90b for estimating the weight of the object to be heated based on a change in temperature of the atmosphere in the heating chamber 2 detected by the temperature sensor 76.

  According to the above configuration, the weight estimation period for supplying a predetermined amount of steam per unit time from the steam generator 70 to the heating chamber 2 by the steam control unit 90 a while circulating the gas in the heating chamber 2 by the circulation fan 19. Then, based on the change in the temperature of the atmosphere in the heating chamber 2 detected by the temperature sensor 76, the weight of the object to be heated is estimated by the weight estimation unit 90b. For example, the temperature of the atmosphere in the heating chamber 2 is a predetermined temperature in a weight estimation period in which a predetermined amount of steam per unit time is supplied into the heating chamber 2 from the steam generator 70 into the heating chamber 2 containing an object to be heated. It is possible to measure the time required to reach and to estimate the weight of the object to be heated having a correlation with the measurement time by the weight estimation unit 90b. In this way, it is possible to estimate the exact weight of the object to be cooked without input by the user, and heat cooking with a good finish can be performed based on the weight, thereby improving convenience.

  In addition, the steam supplied into the heating chamber 2 during the weight estimation period may be steam of 100 ° C. or less, or superheated steam exceeding 100 ° C.

Moreover, in the heating cooker of one embodiment,
Heaters 20, 21 and 22 for heating the inside of the heating chamber 2 are provided,
The control device 90 includes:
A heater control unit 90c for controlling the heaters 20, 21, 22;
During the weight estimation period, the steam control unit 90a controls the steam generator 70 to supply a predetermined amount of steam per unit time from the steam generator 70 into the heating chamber 2 while controlling the heater. The heater 90, 21 and 22 is controlled by the part 90c to heat the inside of the heating chamber 2.

  According to the above embodiment, during the weight estimation period, the steam control unit 90a supplies the steam generator 70 with a predetermined amount of steam per unit time into the heating chamber 2, while the heater control unit 90c supplies the heaters 20 and 21. , 22 is heated to heat the inside of the heating chamber 2 by, for example, heating with superheated steam, and based on the change in the temperature of the atmosphere in the heating chamber 2 at this time, the weight estimation unit 90b causes the inside of the heating chamber 2 to be heated. More accurately estimate the weight of the object to be heated.

Moreover, in the heating cooker of one embodiment,
An infrared sensor 303 for detecting the temperature of the object to be heated in the heating chamber 2;
The control device 90 includes:
During the weight estimation period, the steam control unit 90a alternately repeats the ON operation and the OFF operation of the steam generation device 70, and the heater control unit 90c performs the heaters 20, 21 during the OFF operation period of the steam generation device 70. , 22 is turned on,
The weight estimation is performed based on the temperature of the heated object detected by the infrared sensor 303 during the on-operation period of the heaters 20, 21, and 22 and the weight of the heated object estimated by the weight estimating unit 90b. Control the heating sequence after the period.

  According to the above-described embodiment, the steam control unit 90a alternately repeats the ON operation and the OFF operation of the steam generation device 70 during the weight estimation period, and the heater control unit 90c performs the heaters 20 and 20 during the OFF operation period of the steam generation device 70. In the heating cooker that turns on the heaters 21 and 22, the temperature of the object to be heated is detected by the infrared sensor 303 during the ON operation period of the heaters 20, 21, and 22 (that is, the OFF operation period of the steam generator 70). False detection can be prevented and the state of the object to be heated can be accurately determined.

Moreover, in the heating cooker of one embodiment,
The control device 90 includes:
A heating sequence after the weight estimation period is controlled based on the weight of the object to be heated estimated by the weight estimation unit 90b.

  According to the above embodiment, by controlling the heating sequence after the weight estimation period by the control device 90 based on the weight of the object to be heated estimated by the weight estimating unit 90b, for example, the weight of the object to be heated is set. Accordingly, an appropriate heating output and heating time can be set, and cooking with good finish is possible.

Moreover, in the heating cooker of one embodiment,
An infrared sensor 303 for detecting the temperature of the object to be heated in the heating chamber 2;
The control device 90 includes:
The heating sequence after the weight estimation period is controlled based on the temperature of the object to be heated detected by the infrared sensor 303 and the weight of the object to be heated estimated by the weight estimation unit 90b.

  According to the above embodiment, the control device 90 performs the heating sequence after the weight estimation period based on the temperature of the object to be heated detected by the infrared sensor 303 and the weight of the object to be heated estimated by the weight estimation unit 90b. By controlling, for example, an appropriate heating output and heating time can be set according to the state and weight of the object to be heated, and cooking with good finish is possible.

DESCRIPTION OF SYMBOLS 1 ... Main body casing 1a ... Top plate 2 ... Heating chamber 2a ... Opening part 3 ... Door 4 ... Magnetron 5 ... Exhaust duct 5a ... Outlet 6 ... Dew receptacle 7 ... Outer glass 8 ... Handle 9 ... Operation panel 10 ... Color liquid crystal Display unit 11 ... Button group 12 ... Cancel key 13 ... Start key 14 ... Infrared light receiving unit 15 ... Object to be heated 16A, 16B ... Upper shelf holder 17A, 17B ... Lower shelf holder 18 ... Circulation duct 19 ... Circulation fan 20 ... Upper heater 21 ... Middle heater 22 ... Lower heater 23 ... Circulating damper 25 ... Tube pump 26 ... Water supply tank 27 ... Suction port 28 ... Upper outlet 29 ... First rear outlet 30 ... Second rear outlet 31 ... Third rear outlet 35 ... Steam tube 36 ... Steam pipe 37 ... Steam supply port 40 ... Water supply / drain tube 41 ... Water supply tank body 42 ... Communication pipe 43 ... Tank cover 44 ... Tank joy Port 45 ... Natural exhaust port 47 ... Exhaust fan 48 ... Forced exhaust port 49 ... Exhaust damper 50 ... Supply air port 51 ... Supply air damper 52 ... Cooling damper 53 ... Humidity sensor 54 ... Supply air fan 55 ... Front plate 56 ... Circulation Motor for fan 57 ... Motor for exhaust fan
58 ... Motor for air supply fan
59 ... circulation damper motor 60 ... exhaust damper motor 61 ... air supply damper motor 62 ... cooling damper motor 70 ... steam generator 71 ... steam generator 71a ... bottom 72 ... lid part 73 ... steam generator heater 75 ... Water level sensor 75a, 75b ... Electrode rod 76 ... Internal temperature sensor 80 ... Circulating fan unit 81 ... Base member 82 ... Mounting member 83 ... Motor body 90 ... Control device 90a ... Steam control unit 90b ... Weight estimation unit 90c ... Heater control unit 91, 92 ... Cooking tray 100 ... Air supply unit 101 ... Air supply passage 102 ... First cooling passage 103 ... Second cooling passage 200 ... Exhaust unit 201 ... First air passage 202 ... Second air passage 203 ... Third air passage 204: Fourth air passage 207: Dilution area 300: Infrared sensor unit 301: Cylindrical housing 302: Sensor holder Part 303 ... infrared sensor 304 ... infrared sensor motor 310 ... recess

Claims (1)

A heating chamber for heating an object to be heated;
A circulation fan for circulating the gas in the heating chamber;
A temperature sensor for detecting the temperature of the atmosphere in the heating chamber;
A steam generator for generating steam to be supplied into the heating chamber;
A control device for controlling the circulation fan and the steam generator ;
A heater for heating the inside of the heating chamber;
An infrared sensor for detecting the temperature of the object to be heated in the heating chamber ,
The control device
A steam control unit that controls the steam generator so as to supply a predetermined amount of steam per unit time from the steam generator;
During the weight estimation period in which a predetermined amount of steam per unit time is supplied from the steam generator to the heating chamber by the steam control unit while circulating the gas in the heating chamber by the circulation fan, the temperature sensor A weight estimation unit that estimates the weight of the object to be heated based on the detected temperature change of the atmosphere in the heating chamber ;
Have a <br/> a heater control unit for controlling the heater,
During the weight estimation period, the steam control unit controls the steam generation device to supply a predetermined amount of steam per unit time from the steam generation unit into the heating chamber, and the heater control unit controls the heater. To control the inside of the heating chamber and
In the weight estimation period, the steam control unit alternately repeats the ON operation and the OFF operation of the steam generator, and the heater control unit turns on the heater in the OFF operation period of the steam generator,
The heating sequence after the weight estimation period is controlled based on the temperature of the object to be heated detected by the infrared sensor during the ON operation period of the heater and the weight of the object to be heated estimated by the weight estimation unit. A heating cooker characterized by that.